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7F Class scope name resolution issue · Issue #9991 · python/mypy · GitHub
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Class scope name resolution issue #9991

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hauntsaninja opened this issue Jan 29, 2021 · 0 comments
Open

Class scope name resolution issue #9991

hauntsaninja opened this issue Jan 29, 2021 · 0 comments
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bug mypy got something wrong good-second-issue priority-2-low topic-runtime-semantics mypy doesn't model runtime semantics correctly topic-variable-scope

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@hauntsaninja
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Example courtesy of @gvanrossum , based on https://twitter.com/gvanrossum/status/1354305179244392453

While Python's behaviour is surprising, mypy should match it.

from typing import *

x: Optional[int] = None
y: Optional[int] = None

def f() -> None:
    x = 1
    y = 1
    class C:
        reveal_type(x)  # Correctly reveals int
        reveal_type(y)  # Incorrectly reveals int, should be Optional[int]
        x = 2

I also found https://bugs.python.org/issue24129 interesting. Thanks, ilevkivskyi!
@hauntsaninja hauntsaninja added bug mypy got something wrong priority-2-low labels Jan 29, 2021
@AlexWaygood AlexWaygood added topic-runtime-semantics mypy doesn't model runtime semantics correctly topic-variable-scope labels Mar 31, 2022
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